I offered a colleague to put the binding on his mom's quilt that just came back from the Long-armer. The LA did not take care to do a nice square pattern. I will have to cut off or cover some of the quilting with the binding. This makes me upset but I have no choice. There is no way to fix it.
As for the rulers and the feet - I try to use the same ruler throughout the project, just in case one is not consistent with the other and I have not had any problems. One of my feet (the one with the 1/4" guide) sews a wider than 1/4" seam so I banned it. Now I use the regular 1/4" foot and as long as I am consistent all will be well.